CN116368315A - Shock absorber with hydraulic rebound stopper - Google Patents
Shock absorber with hydraulic rebound stopper Download PDFInfo
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- CN116368315A CN116368315A CN202180071385.9A CN202180071385A CN116368315A CN 116368315 A CN116368315 A CN 116368315A CN 202180071385 A CN202180071385 A CN 202180071385A CN 116368315 A CN116368315 A CN 116368315A
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- shock absorber
- cup
- sealing ring
- hydraulic
- rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/49—Stops limiting fluid passage, e.g. hydraulic stops or elastomeric elements inside the cylinder which contribute to changes in fluid damping
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
A hydraulic shock absorber (10), in particular for a vehicle suspension, comprises a cylindrical tube (14), a rod (18), a main piston (20) and a hydraulic stopper (30), the hydraulic stopper (30) comprising a cup-shaped body (32) and an auxiliary piston (34), the auxiliary piston (34) comprising a cylinder (50) made of plastic, a sealing ring (54) also made of plastic and an annular body (60) made of metallic material, suitable to form a support surface or axial support seat for the cylinder (50).
Description
The present invention relates generally to an end of hydraulic travel stop for use on a hydraulic shock absorber (e.g., mono-tube or dual-tube) for a vehicle suspension. More particularly, the present invention relates to hydraulic stops that operate during extension movement of a shock absorber.
Conventionally, a hydraulic shock absorber for a vehicle suspension has a first end-of-travel buffer disposed within the shock absorber and configured to function during an extension stroke of the shock absorber, and a second end-of-travel buffer disposed outside the shock absorber and configured to function during a compression stroke of the shock absorber.
The end-of-travel buffer may be of the elastic or hydraulic type.
The end of spring travel damper is made of a highly rigid elastomeric material (e.g., polyurethane) that functions to ensure that when the damper reaches the end of travel position, there is a spring shock between the contacting surfaces, both in the extension stage and in the compression stage, thereby preventing these shocks from occurring between the metal surfaces. Thus, the end of travel damper acts like a spring, acting in parallel with the mechanical spring (main spring) of the suspension at the end of travel position, and has a much higher stiffness than the mechanical spring of the suspension. However, the end of spring travel bumper does not act on any intermediate point of the bumper travel.
The end of spring travel buffer has the following drawbacks, among others. When the shock absorber is subjected to a violent impact, for example, stretching or compression due to the presence of an obstacle (pothole or jolt) on the road, the kinetic energy of the suspension is converted into elastic deformation energy of the relevant shock absorber. The elastic energy stored by the buffer is completely (or almost) released in the next phase of the reversal of the movement. Therefore, after the impact, the suspension continues to vibrate without its motion being sufficiently damped, and these vibrations cause deterioration of the contact condition between the road and the tire, thereby deteriorating the grip of the vehicle on the road.
In order to overcome the above-mentioned drawbacks of the elastic damper, it is known to use a hydraulic stopper alone or in combination with the elastic damper.
The hydraulic stop is a dissipation device that, when the end-of-travel position is reached, allows the kinetic energy of the suspension to be dissipated hydraulically, i.e. forcing a volume of the reservoir pressure contained in the shock absorber through a properly calibrated passage, depending on the speed of movement of the shock absorber. In this way, the energy generated as a result of the impact is dissipated hydraulically and does not return to the suspension in the subsequent reversal of motion. Vibrations of the suspension are thus suppressed, thereby improving the grip condition between the road and the tire, and thus improving the grip of the vehicle on the road.
In addition, since the hydraulic stoppers act in parallel with their respective elastic buffers, part of energy generated by the impact is hydraulically absorbed, so that the elastic buffers and their supports can be reduced in size.
Finally, although the elastic bumpers react only on the deformations they are subjected to, the action of the hydraulic stops is proportional to the speed at which the shock absorber rod reaches the end-of-travel position. Thus, the hydraulic stopper can more advanced cope with the impact occurring when the shock absorber reaches its stroke end position, thereby reducing noise.
A hydraulic stop is typically used as an end of rebound stroke device, wherein an automotive hydraulic stop comprises a cup adapted to be attached within a rebound chamber of a shock absorber and a piston adapted to be attached to a rod of the shock absorber. The piston is slidable along the cylindrical side wall of the cup. The wall conveniently has a series of channels to allow oil to escape as the piston is pushed towards the cup during the extension stroke of the shock absorber and thereby compress the oil contained in the working chamber of the cup.
In the shock absorber thus constructed, since oil leaks out of the cup through the passage provided in the cylindrical side wall of the cup, the piston movement and the shock absorber rod movement are thereby damped during the shock absorber extension stroke. These channels have a decreasing cross section in the direction of the extension stroke of the shock absorber, so that the damping effect produced by the device increases as the piston moves towards the inside of the cup.
It is an object of the present invention to provide a hydraulic shock absorber for a vehicle suspension that operates during extension that combines strength, low inertia and an optimal coefficient of friction at the interface between the piston and the cup.
Another object of the invention is to provide a hydraulic buffer that can be manufactured in a simple and economical manner.
These and other objects are achieved, according to the present invention, entirely by a hydraulic stop having the features defined in the appended claims.
In summary, the invention is based on the idea of manufacturing piston parts (i.e. cylinders and/or sealing rings, defined below) and/or cup-shaped bodies from plastic material, whereby these parts can be shaped in such a way that they improve the mechanical and structural properties of the device. This allows the device to be lighter from a structural point of view and simplifies manufacture.
Advantageous embodiments of the invention are specified in the dependent claims, the content of which is to be understood as an integral and constituent part of the following description.
Brief description of the drawings
The functional and structural features of some preferred embodiments of a shock absorber with a hydraulic rebound damper according to the present invention will now be described. Referring to the attached drawings, wherein:
FIG. 1 is an axial cross-section of a shock absorber including a rebound stopper according to one embodiment of the present invention;
FIG. 2 is an axial cross-section of a hydraulic rebound stopper incorporated in a shock absorber according to one embodiment of the present invention;
FIG. 3 is a longitudinal cross-sectional exploded view of a hydraulic rebound stopper according to one embodiment of the present invention;
fig. 4A and 4B are two perspective views of a piston for a hydraulic stop during an extension stroke of a shock absorber and during a compression stroke of the shock absorber, respectively, according to one embodiment of the invention;
fig. 5A and 5B are a side view and a perspective view from below, respectively, of a piston for a hydraulic stop according to one embodiment of the invention; and
fig. 6A and 6B are a side view and a top perspective view, respectively, of a piston for a hydraulic stop according to another embodiment of the invention.
Detailed Description
Before describing in detail embodiments of the invention, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. It is also to be understood that the phraseology and terminology is for the purpose of description and should not be regarded as limiting.
By way of example, referring to fig. 1, a hydraulic shock absorber 10, particularly for a vehicle suspension, includes a cylindrical tube 14; a rod 18; the stem 18 is arranged coaxially with the cylindrical tube 14 and partially protrudes therefrom; and a master piston 20, the master piston 20 being attached to a first end of the rod 18 and slidably mounted in the cylindrical tube 14, thereby dividing the interior volume of the cylindrical tube 14 into an expansion chamber 22 and a compression chamber 24.
The hydraulic shock absorber 10 further includes a hydraulic stop 30 disposed in the extension chamber 22 and adapted to operate during the extension stroke of the shock absorber 10 to hydraulically dissipate kinetic energy as the shock absorber 10 approaches an end position of the extension stroke.
The hydraulic stop 30 includes a cup 32 mounted in and coaxial with the expansion chamber 24 of the shock absorber 10, and an auxiliary piston 34 mounted to and coaxial with the first end of the rod 18 of the shock absorber 10 and below the main piston 20 of the shock absorber.
The cup 32 in turn comprises a side wall 36, the side wall 36 defining, together with the auxiliary piston 34 of the hydraulic stop 30, a working chamber 52, the working chamber 52 suitably coinciding with an end portion of the expansion chamber 24. The working chamber 52 is thus contained within the internal volume of the cup 32 and is configured such that the damping fluid from the shock absorber 10 is compressed by the auxiliary piston 34 of the hydraulic stop 30 during the extension stroke of the shock absorber.
The auxiliary piston 34 comprises a cylindrical body 50 attached to the stem 18 of the shock absorber 10 and having an outer diameter smaller than the inner diameter of the side wall 36 of the cup 32; a sealing ring 54 axially slidably mounted with respect to the cylindrical body 50 and adapted to seal against the inner surface of the side wall 36 of the cup-shaped body 32; and first and second annular support elements 56, 58 axially constrained to the cylinder 50 and configured to axially limit axial sliding movement of the seal ring 54 along the cylinder 50 in either direction. In short, the first annular support element 56 (i.e. the axially lower end support seat for the sealing ring 54, as shown by way of example in fig. 3 and 4B) is formed by the upper surface of a ring, which is integrally formed with a portion of the cylinder 50.
The sealing ring 54, the first support element 56 and the second support element 58 are configured such that, during an extension stroke of the shock absorber 10, the sealing ring 54 abuts the first support element 56 and does not allow damping fluid to flow from one side of the sealing ring 54 to the other side as the sealing ring 54 runs along the inner surface of the side wall 36 of the cup 32, while during a compression stroke of the shock absorber 10, the sealing ring 54 abuts the second support element 58 allowing damping fluid to flow from one side of the sealing ring 54 to the other side.
The cylinder 50 and the sealing ring 54 are of plastic material, and the auxiliary piston 34 further comprises an annular body 60 made of metallic material, suitable for forming a support surface or axial support seat for the cylinder 50.
In practice, the annular body 60 is coupled to the cylindrical body 50 on the side of the auxiliary piston 34 axially opposite to the side facing the working chamber 52. The auxiliary piston 34 is thus configured so that when the cylinder 50 reaches the end of extension stroke position of the hydraulic shock absorber 10, the annular body 60 forms an axial seat for said cylinder 50, preventing it from sliding along the rod 18 in the opposite direction and axially locking the auxiliary piston 34 on the rod 18. To this end, the cup 32 is preferably provided with a shoulder 38 projecting radially inwards from the cup 32 and adapted to form a support seat against which the auxiliary piston 34 will rest when the hydraulic shock absorber 10 is in the end-of-extension stroke position (as shown in fig. 2).
According to one embodiment (shown by way of example in fig. 2), the rod 18 comprises a coupling seat having a profile complementary to the inner profile of the cylinder 50 and the annular body 60, whereby said cylinder 50 and annular body 60 are attached to the rod 18 by shape-coupling of their respective profiles.
Preferably, the stem 18 has two circumferential groove portions at the axially outermost edges of the cylindrical body 50 and the annular body 60, which are radially recessed towards the axis of the stem 18, whereby they abut in respective circumferential recesses. Thus, an optimal shape coupling of the auxiliary piston 34 with the piston rod 18 is achieved.
The annular body 60 is in turn connected to the cylindrical body 50 by means of a shape coupling between at least one hook 62 axially projecting from the cylindrical body 50 and a projection radially projecting from the annular body 60.
The coupling may be achieved by configuring the hooks 62 to engage with the protrusions of the ring body 60 by surrounding the protrusions of the ring body 60 from the outside (e.g., as shown in fig. 5A and 5B).
Alternatively (e.g., as shown in fig. 6A and 6B), the projection radially protruding from the annular body 60 may comprise at least one radial seat 64 configured as a recess into which the hook 64 is inserted and secured.
According to one embodiment, the sealing ring 54 has an open annular shape.
According to a preferred embodiment, the cup-shaped body 32 is made of plastic material.
According to a preferred embodiment, the plastic material from which the cylinder 50 and/or the sealing ring 54 and/or the cup 32 are made is a composite material reinforced with glass or carbon fibers.
According to a preferred embodiment, the hydraulic shock absorber 10 is configured as a dual tube hydraulic shock absorber for a vehicle suspension. In this configuration, the hydraulic shock absorber 10 includes an outer cylindrical tube (coinciding with the main body tube 15 of the hydraulic shock absorber 10) and an inner cylindrical tube (coinciding with the cylindrical tube 14 described above in this embodiment, the cup-shaped body 32 radially abuts against the cylindrical tube 14). The inner cylindrical tube is coaxial with the outer cylindrical tube and defines therewith an annular chamber filled with gas at its upper portion, and the rod 18 is arranged coaxially with the two cylindrical tubes and partly protrudes therefrom. The master piston 20 is slidably mounted in the inner cylindrical tube and is attached to the lower end of the rod 18. The main piston 20 divides the interior volume of the inner cylindrical tube 14 into an expansion chamber and a compression chamber, which contain damping fluid (oil).
According to one aspect of the invention (not shown), the hydraulic shock absorber 10 is configured as a single-tube hydraulic shock absorber for vehicle suspensions, i.e. comprises only an outer cylindrical tube (coinciding with the main tube 15 in the hydraulic shock absorber 10, which main tube 15 in turn coincides with the cylindrical tube 14 in this embodiment, the cup 32 radially resting on the cylindrical tube 14).
Preferably, the axial passage 44 is provided on the inner surface of the side wall 36 of the cup-shaped body 32, which extends parallel to the longitudinal axis (z) of the cup-shaped body 32, and is adapted to allow the damping fluid to flow axially from the working chamber 52 when the auxiliary piston 34 flows through the working chamber 52 towards the end of extension stroke position of the shock absorber 10 (for example towards the shoulder 38 of the cup-shaped body 32).
The axial channel 44 has a cross-section with an area that continuously decreases along the longitudinal axis (z) toward the end of extension stroke position of the shock absorber 10.
According to the invention, the cup 32 is made of plastic material and the entire outer surface of the side wall 36 of the cup 32 is in direct contact with the cylindrical tube 14, said cylindrical tube 14 forming the outer cylindrical tube 10 of the shock absorber. More precisely, the purpose is to present a portion (axial) of the cup-shaped body 32 along which the auxiliary piston 34 slides, with which substantially the entire surface of the side wall 36, corresponding to said portion and facing the inner wall of the cylindrical tube 15, is in contact.
In the present description and claims, terms and expressions indicating position and orientation, such as "longitudinal", "transverse", "vertical" or "horizontal", refer to the longitudinal axis (z) of the hydraulic shock absorber 10.
Various aspects and embodiments of a hydraulic shock absorber having a hydraulic rebound stopper according to the present invention have been described. It is to be understood that each embodiment may be combined with any of the other embodiments. Furthermore, the invention is not limited to the described embodiments, but may be varied within the scope of the appended claims.
Claims (15)
1. A hydraulic shock absorber (10), in particular for a vehicle suspension, comprises
A cylindrical tube (14),
a rod (18) coaxially arranged with the cylindrical tube (14) and protruding from a portion thereof,
a master piston (20) secured to the first end of the rod (18) and slidably mounted in the cylindrical tube (14) to divide the interior volume of the cylindrical tube (14) into an expansion chamber (22) and a compression chamber (24), an
A hydraulic buffer (30) arranged in the extension chamber (22) and adapted to operate during an extension stroke of the shock absorber (10) to hydraulically dissipate kinetic energy when the shock absorber (10) approaches an end-of-extension stroke position;
wherein the hydraulic buffer (30) comprises a cup-shaped body (32) mounted in and coaxial with the expansion chamber (24) of the shock absorber (10), and an auxiliary piston (34) mounted at the first end of the rod (18) of the shock absorber (10) and coaxial therewith, below the main piston (20) of the shock absorber, and
wherein the cup-shaped body (32) comprises a side wall (36), the side wall (36) defining, together with an auxiliary piston (34) of the hydraulic buffer (30), a working chamber (52), in which working chamber (52) damping fluid of the shock absorber (10) is compressed by the auxiliary piston (34) of the hydraulic buffer (30) during an extension stroke of the shock absorber (10),
the auxiliary piston (34) comprises a cylinder (50), the cylinder (50) being fixed to the rod (18) of the shock absorber (10) and having an outer diameter smaller than the inner diameter of the side wall (36) of the cup-shaped body (32); a sealing ring (54) axially slidably mounted around the cylindrical body (50) and adapted to seal against an inner surface of the side wall (36) of the cup-shaped body (32); and first and second annular support elements (56, 58) axially constrained to the cylindrical body (50) and configured to axially constrain the sealing ring (54) against the axial sliding movement of the cylindrical body (50) in both directions, the sealing ring (54), the first support element (56) and the second support element (58) being configured such that, when the sealing ring (54) slides along the inner surface of the side wall (36) of the cup (32) during the extension stroke of the shock absorber (10), the sealing ring abuts against the first support element (56) and no damping fluid passes from one side of the sealing ring (54) to the other side, whereas, during the compression stroke of the shock absorber (10), said sealing ring (54) abuts against the second support element (58) and allows the damping fluid to pass from one side of the sealing ring (54) to the other side,
wherein, the material of the cylinder (50) and the sealing ring (54) is plastic,
and wherein the auxiliary piston (34) further comprises an annular body (60) made of metallic material, said annular body (60) being coupled to the cylinder (50) on the side of the auxiliary piston (34) axially opposite to the side facing the working chamber (52), said annular body (60) being adapted to form a support surface or axial support seat of the cylinder (50),
it is characterized in that the method comprises the steps of,
the annular body (60) is connected to the cylindrical body (50) by a shape coupling between at least one hook (62) axially protruding from the cylindrical body (50) and a projection radially protruding from the annular body (60).
2. The hydraulic shock absorber according to claim 1, wherein the rod (18) comprises a coupling seat having a profile complementary to the inner profile of the cylinder (50) and the annular body (60), such that the cylinder (50) and the annular body (60) are fixed to the rod (18) by shape coupling of the respective profiles.
3. The hydraulic shock absorber according to claim 2, wherein the rod (18) has two circumferential recesses at the axially outermost edges of the cylindrical body (50) and the annular body (60), said outer edges being radially recessed towards the axis of the rod (18) so as to abut against the respective circumferential recesses.
4. The hydraulic shock absorber according to any of the preceding claims, wherein the projection radially protruding from the annular body (60) comprises at least one radial seat (64), said radial seat (64) being configured as a recess for inserting and securing the hook (64).
5. Hydraulic shock absorber according to any of the preceding claims, wherein the plastic material from which the sealing ring (54) is made is a composite material reinforced with glass or carbon fibres.
6. The hydraulic shock absorber according to any of the preceding claims, wherein the cup-shaped body (32) is preferably provided with a shoulder (38), said shoulder (38) protruding radially towards the interior of the cup-shaped body (32) and being adapted to form a stop against the auxiliary piston (34) when the hydraulic shock absorber (10) is in the end-of-extension stroke position.
7. The hydraulic shock absorber according to any of the preceding claims, wherein the sealing ring (54) has an open annular shape.
8. The hydraulic shock absorber according to any of the preceding claims, wherein the hydraulic shock absorber (10) is configured as a double tube hydraulic shock absorber for a vehicle suspension, comprising an outer cylindrical tube coinciding with a main body tube (15) of the hydraulic shock absorber (10), and an inner cylindrical tube coinciding with a cylindrical tube (14), against which cylindrical tube (14) a cup (32) rests radially, said inner cylindrical tube being coaxial with the outer cylindrical tube and defining therein an annular chamber filled with gas at an upper portion thereof, a rod (18) being arranged coaxially with said cylindrical tube and partly protruding therefrom.
9. The hydraulic shock absorber according to any of claims 1 to 7, wherein the hydraulic shock absorber (10) is configured as a monotube hydraulic shock absorber for a vehicle suspension, comprising only a main body tube (15) of the hydraulic shock absorber (10), said main body tube (15) coinciding with a cylindrical tube (14) against which a cup (32) radially abuts.
10. Hydraulic shock absorber according to any of the preceding claims, wherein an axial channel (44) is provided on the inner surface of the side wall (36) of the cup (32), which extends parallel to the longitudinal axis (z) of the cup (32) and is adapted to allow an axial outflow of damping fluid from the working chamber (52) when the auxiliary piston (34) slides into the working chamber (52) towards the extension stroke end of the shock absorber (10), said axial channel (44) having a cross section with an area continuously decreasing along the longitudinal axis (z) towards said extension stroke end of the shock absorber (10).
11. Hydraulic shock absorber according to any of the preceding claims, wherein the cup-shaped body (32) is made of a plastic material.
12. Hydraulic shock absorber (10), in particular for a vehicle suspension, comprising
A cylindrical tube (14),
a rod (18) coaxially arranged with the cylindrical tube (14) and protruding from a portion thereof,
a master piston (20) secured to the first end of the rod (18) and slidably mounted in the cylindrical tube (14) to divide the interior volume of the cylindrical tube (14) into an expansion chamber (22) and a compression chamber (24), an
A hydraulic damper (30) disposed in the rebound chamber (24) and adapted to operate during an extension stroke of the shock absorber (10) to hydraulically dissipate kinetic energy as the shock absorber (10) approaches an end-of-extension stroke position,
wherein said hydraulic damper (30) comprises a cup-shaped body (32) made of plastic material and mounted in and coaxial with the expansion chamber (22) of the damper (10), and an auxiliary piston (34) mounted at said first end of the rod (18) of the damper (10), coaxial therewith and located below the main piston (20) of the damper,
wherein the cup (32) comprises a side wall (36), the side wall (36) defining a working chamber (52) with an auxiliary piston (34) of the hydraulic buffer (30), wherein during an extension stroke of the shock absorber the damping fluid of the shock absorber (10) is compressed by the auxiliary piston (34) of the hydraulic buffer (30), and
wherein an axial channel (44) is provided on the inner surface of the side wall (36) of the cup-shaped body (32), which extends parallel to the longitudinal axis (z) of the cup-shaped body (32) and is adapted to allow an axial outflow of damping fluid from the working chamber (52) when the auxiliary piston (34) slides into the working chamber (52) towards the position of the extension end of travel of the shock absorber (10), said axial channel (44) having a cross section with an area that continuously decreases along the longitudinal axis (z) towards said extension end of travel position of the shock absorber (10),
it is characterized in that the method comprises the steps of,
the entire outer surface of the side wall (36) of the cup-shaped body (32) is in direct contact with the cylindrical tube (14),
and, in addition, the processing unit,
the hydraulic shock absorber (10) is configured as a monotube hydraulic shock absorber for a vehicle suspension, comprising only a main body tube (15) of the hydraulic shock absorber (10), the main body tube (15) coinciding with a cylindrical tube (14), against which a cup (32) radially abuts.
13. The hydraulic shock absorber according to claim 12, wherein the auxiliary piston (34) comprises a cylinder (50) fixed to the rod (18) of the shock absorber (10) and having an outer diameter smaller than the inner diameter of the side wall (36) of the cup (32); -a sealing ring (54), said sealing ring (54) being axially slidably mounted around the cylindrical body (50) and being adapted to seal against an inner surface of the side wall (36) of the cup-shaped body (32); and first and second annular support elements (56, 58) axially constrained to the cylindrical body (50) and configured to axially constrain the sealing ring (54) in both directions along the axial sliding movement of the cylindrical body (50), the sealing ring (54), the first support element (56) and the second support element (58) being configured such that when the sealing ring (54) slides along the inner surface of the side wall (36) of the cup (32) during the extension stroke of the shock absorber (10), the sealing ring (54) is in contact with the first support element (56) and no damping fluid passes from one side of the sealing ring (54) to the other, whereas during the compression stroke of the shock absorber (10), the sealing ring (54) abuts against the second support element (58) and allows the damping fluid to pass from one side of the sealing ring (54) to the other,
wherein the cylinder (50) and the sealing ring (54) are made of plastic material, and
wherein the auxiliary piston (34) further comprises an annular body (60) made of metallic material coupled to the cylinder (50) on the side of the auxiliary piston (34) axially opposite to the side facing the working chamber (52), said annular body (60) being adapted to form a support surface or axial seat for the cylinder (50).
14. The hydraulic shock absorber according to claim 13, wherein the rod (18) comprises a coupling seat having a profile complementary to the inner profile of the cylinder (50) and the annular body (60), such that the cylinder (50) and the annular body (60) are fixed to the rod (18) by shape coupling of the respective profiles.
15. Hydraulic shock absorber according to claim 14, wherein the rod (18) has two circumferential recesses at the axially outermost edges of the cylinder (50) and the annular body (60), said outer edges being radially recessed towards the axis of the rod (18) so as to rest in respective circumferential grooves.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102020000024643 | 2020-10-19 | ||
| IT202000024643 | 2020-10-19 | ||
| PCT/IB2021/059556 WO2022084822A1 (en) | 2020-10-19 | 2021-10-18 | Shock absorber with hydraulic rebound stop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116368315A true CN116368315A (en) | 2023-06-30 |
Family
ID=74068557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180071385.9A Pending CN116368315A (en) | 2020-10-19 | 2021-10-18 | Shock absorber with hydraulic rebound stopper |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4229315A1 (en) |
| CN (1) | CN116368315A (en) |
| WO (1) | WO2022084822A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023103258A1 (en) | 2023-02-10 | 2024-08-14 | Thyssenkrupp Ag | Vibration damper with tension stop |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2394948T3 (en) * | 2009-09-18 | 2013-02-06 | Bwi Company Limited S.A. | Shock absorber with a hydraulic rebound stop |
| CN105370789B (en) * | 2015-12-02 | 2017-05-31 | 北京京西重工有限公司 | Hydraulic suspension damper with hydraulic machinery stroke stop device |
| US10830303B2 (en) * | 2017-11-22 | 2020-11-10 | Beijingwest Industries Co., Ltd. | Shock absorber assembly including hydraulic stop mechanism with stabilizer pins |
| DE102018207911A1 (en) * | 2018-05-18 | 2019-11-21 | Zf Friedrichshafen Ag | Vibration damper with a hydraulic end stop |
-
2021
- 2021-10-18 EP EP21805616.6A patent/EP4229315A1/en active Pending
- 2021-10-18 CN CN202180071385.9A patent/CN116368315A/en active Pending
- 2021-10-18 WO PCT/IB2021/059556 patent/WO2022084822A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022084822A1 (en) | 2022-04-28 |
| EP4229315A1 (en) | 2023-08-23 |
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